#include <math.h>

unsigned char coder( unsigned char codes )
{
    bytes coders;
    coders.byte = codes & 0x0f;
    coders.byte = coders.byte << 3;
    coders.bits.bit2 = ( ( coders.bits.bit6 + coders.bits.bit5 ) % 2 + coders.bits.bit4 ) % 2;
    coders.bits.bit1 = ( ( coders.bits.bit5 + coders.bits.bit4 ) % 2 + coders.bits.bit3 ) % 2;
    coders.bits.bit0 = ( ( coders.bits.bit6 + coders.bits.bit5 ) % 2 + coders.bits.bit3 ) % 2;
    return coders.byte;
}


unsigned char encoder( unsigned char encodes, unsigned char* codes )
{
    bytes encoders, cas;
    encoders.byte = encodes & 0x7f;
    cas.byte = 0;
    cas.bits.bit2 = ( ( ( encoders.bits.bit6 + encoders.bits.bit5 ) % 2 + encoders.bits.bit4 ) % 2 + encoders.bits.bit2 ) % 2; //s1
    cas.bits.bit1 = ( ( ( encoders.bits.bit5 + encoders.bits.bit4 ) % 2 + encoders.bits.bit3 ) % 2 + encoders.bits.bit1 ) % 2; //s2
    cas.bits.bit0 = ( ( ( encoders.bits.bit6 + encoders.bits.bit5 ) % 2 + encoders.bits.bit3 ) % 2 + encoders.bits.bit0 ) % 2; //s3
    if( cas.byte == 0 )
    {
        *codes = encoders.byte >> 3;
        return 0;
    }
    else
    {
        switch( cas.byte )
        {
            case 0x03:
                encoders.bits.bit3 = ~encoders.bits.bit3;
                break;
            case 0x06:
                encoders.bits.bit4 = ~encoders.bits.bit4;
                break;
            case 0x07:
                encoders.bits.bit5 = ~encoders.bits.bit5;
                break;
            case 0x05:
                encoders.bits.bit5 = ~encoders.bits.bit5;
                break;
            default:
                ;
        }
        *codes = encoders.byte >> 3;
        return 1;
    }
}
void main_codec( void );
void main_codec( void )
{
    bytes a;
#ifndef ISPLC_13_1X
    bytes b;
#endif
    unsigned char n, m;
    a.byte = 0xf5;
    printf( "\na.chars =0x%x\n", a.byte );
    printf( "a.bits.bit0 =%d\n", a.bits.bit0 );
    printf( "a.bits.bit1 =%d\n", a.bits.bit1 );
    printf( "a.bits.bit2 =%d\n", a.bits.bit2 );
    printf( "a.bits.bit3 =%d\n", a.bits.bit3 );
    printf( "a.bits.bit4 =%d\n", a.bits.bit4 );
    printf( "a.bits.bit5 =%d\n", a.bits.bit5 );
    printf( "a.bits.bit6 =%d\n", a.bits.bit6 );
    printf( "a.bits.bit7 =%d\n", a.bits.bit7 );
    n = coder( 0x06 );
    printf( "\nthe origin coders =0x06\t the hamming coders  =0x%x\n", n );
    n = n | 0x04;
    printf( "the hamming coders with one mistake  =0x%x\n", n );
    if( encoder( n, &m ) )
    {
        printf( "one misstake found\t" );
        printf( "the right coders should be=0x%x\n", m );
    }
    else
    {
        printf( "NO misstake found!!\t" );
        printf( "the right coders  =0x%x\n", m );
    }
}


uint16_t CRC16_check( uint16_t* Data, uint16_t Data_length )
{
    uint16_t mid = 0;
    uint16_t times = 0, Data_index = 0;
    uint16_t sCRC = 0xFFFF;
    while( Data_length )
    {
        sCRC = Data[Data_index] ^ sCRC;
        for( times = 0; times < 8; times++ )
        {
            mid = sCRC;
            sCRC = sCRC >> 1;
            if( mid & 0x0001 )
            {
                sCRC = sCRC ^ 0xA001;
            }
        }
        Data_index++;
        Data_length--;
    }
    return sCRC;
}

const uint8_t CRC8_TAB[256]   =
{
    0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
    0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
    0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
    0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
    0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
    0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
    0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
    0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
    0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
    0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
    0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
    0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
    0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
    0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
    0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
    0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
};

uint8_t CRC8_Tab( uint8_t* ucPtr, uint8_t ucLen )
{
    uint8_t ucIndex;
    uint8_t ucCRC8   =   0;
    while( ucLen -- )
    {
        ucIndex   =   ucCRC8   ^ ( *ucPtr++ );
        ucCRC8   =   CRC8_TAB[ucIndex];
    }
    return ( ~ucCRC8 );
}